﻿/************************************************************************

   Extended Silverlight Toolkit

   Copyright (C) 2010-2012 Xceed Software Inc.

   This program is provided to you under the terms of the Microsoft Public
   License (Ms-PL) as published at http://extendedsilverlight.codeplex.com/license

   Please purchase a commercial version of this toolkit if you are using
   it in a commercial product. The commercial versions support the project,
   and also include more features for each control, priority support,
   source code, updates, removed watermark, and a proprietary license.

   Visit http://xceed.com and follow @datagrid on Twitter.

  **********************************************************************/

using System;
using System.Collections.Generic;

namespace Xceed.Silverlight.Data.Collections
{
  internal static class ImmutableCollectionExtensions
  {
    internal static ImmutableCollection<T> AsImmutable<T>( this IEnumerable<T> source )
    {
      if( source == null )
        throw new ArgumentNullException( "source" );

      ImmutableCollection<T> collection = source as ImmutableCollection<T>;
      if( collection != null )
        return collection;

      return new ImmutableCollection<T>( source );
    }
  }
}
